Sport Specificity is the number one reason. Think of not just the range of motion but the speed of contractions when skiing. We want to train sport specific muscle recruitment patters. Slow, deep squats are great for…..wait for it….doing slow deep squats. This program is about training neuromuscular recruitment patterns as the FT fibers fatigue.
Safety for the unskilled squatter is number two. 1 person in a hundred who squats can do a deep squat safely. We do not know who is going to but these programs.
I hope this helps,